Bb Tenor trombone 8H Symphony. C.G. Conn Instruments standing for high quality american made brass instruments. The history shows the long periode of making experiences and getting better. But the main effort based on passion and love for music. Play and you will hear it. Features 547" bore (13,89 mm), Bell Ø 8 1/2" = 216 mm, Gold brass outer slide tubes, CONN 5G mouthpiece, Wood shell case, Lacquered finish, Gold brass bell, Hand-hammered one-piece bell, Hard chrome-plated nickel silver inner slides.